. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. n the reader remembers that he isstudying this reaction for the aid it affords him in learning Chem-istry, and not because he is desirous of manufacturing caustic pot-ash, he will see that this latter part of the reaction is quite asimportant as the former. To complete the diagram, then, he mustfirst know what other compound is produced, and its formula. Thecontext of his Manual will afford this
. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. n the reader remembers that he isstudying this reaction for the aid it affords him in learning Chem-istry, and not because he is desirous of manufacturing caustic pot-ash, he will see that this latter part of the reaction is quite asimportant as the former. To complete the diagram, then, he mustfirst know what other compound is produced, and its formula. Thecontext of his Manual will afford this information. In this case cal-cium carbonate is produced (CaC03). (This product is, in fact, pre- POTASSIUM. 65 cipitated chalk, together with any excess of slaked lime and anynatural impurities in the slaked lime. Pure precipitated chalkis made by an analogous reaction, described subsequently.) Thesource of the elements of the calcium carbonate, and, finally, theirunion, must be indicated just as the source and mode of formationof the potash were indicated; that is to say, after the formula ofthis second substance produced (CaC03) is written on the right handof the diagram, thus— 2KHO CaCO,. Ca2HO the source of its elements is shown by writing the symbols for thoseelements on the right of the bracket attached to the formula con-taining the symbols of the elements, thus : 2KHO CaCO,
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